<?php
/*=======================================================================
 // File:        JPGRAPH_CANVAS.PHP
 // Description: Canvas drawing extension for JpGraph
 // Created:     2001-01-08
 // Ver:         $Id: jpgraph_canvas.php 1923 2010-01-11 13:48:49Z ljp $
 //
 // Copyright (c) Aditus Consulting. All rights reserved.
 //========================================================================
 */

//===================================================
// CLASS CanvasGraph
// Description: Creates a simple canvas graph which
// might be used together with the basic Image drawing
// primitives. Useful to auickoly produce some arbitrary
// graphic which benefits from all the functionality in the
// graph liek caching for example.
//===================================================
class CanvasGraph extends Graph {
	//---------------
	// CONSTRUCTOR
	function __construct($aWidth=300,$aHeight=200,$aCachedName="",$timeout=0,$inline=1) {
		parent::__construct($aWidth,$aHeight,$aCachedName,$timeout,$inline);
	}

	//---------------
	// PUBLIC METHODS

	function InitFrame() {
		$this->StrokePlotArea();
	}

	// Method description
	function Stroke($aStrokeFileName="") {
		if( $this->texts != null ) {
			for($i=0; $i < count($this->texts); ++$i) {
				$this->texts[$i]->Stroke($this->img);
			}
		}
		if( $this->iTables !== null ) {
			for($i=0; $i < count($this->iTables); ++$i) {
				$this->iTables[$i]->Stroke($this->img);
			}
		}
		$this->StrokeTitles();

		// If the filename is the predefined value = '_csim_special_'
		// we assume that the call to stroke only needs to do enough
		// to correctly generate the CSIM maps.
		// We use this variable to skip things we don't strictly need
		// to do to generate the image map to improve performance
		// a best we can. Therefor you will see a lot of tests !$_csim in the
		// code below.
		$_csim = ($aStrokeFileName===_CSIM_SPECIALFILE);

		// We need to know if we have stroked the plot in the
		// GetCSIMareas. Otherwise the CSIM hasn't been generated
		// and in the case of GetCSIM called before stroke to generate
		// CSIM without storing an image to disk GetCSIM must call Stroke.
		$this->iHasStroked = true;

		if( !$_csim ) {

			// Should we do any final image transformation
			if( $this->iImgTrans ) {
				if( !class_exists('ImgTrans',false) ) {
					require_once('jpgraph_imgtrans.php');
				}

				$tform = new ImgTrans($this->img->img);
				$this->img->img = $tform->Skew3D($this->iImgTransHorizon,$this->iImgTransSkewDist,
				$this->iImgTransDirection,$this->iImgTransHighQ,
				$this->iImgTransMinSize,$this->iImgTransFillColor,
				$this->iImgTransBorder);
			}


			// If the filename is given as the special _IMG_HANDLER
			// then the image handler is returned and the image is NOT
			// streamed back
			if( $aStrokeFileName == _IMG_HANDLER ) {
				return $this->img->img;
			}
			else {
				// Finally stream the generated picture
				$this->cache->PutAndStream($this->img,$this->cache_name,$this->inline,$aStrokeFileName);
				return true;
			}
		}
	}
} // Class

/* EOF */
?>